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- Find the word done by the force F in moving an object from P to Q. F = 2i - 3j; P(0, 0), Q(3, 6)Suppose you are navigating a spacecraft far from other objects. The mass of the spacecraft is 4.0 x 104 kg (about 40 tons). The rocket engines are shut off, and you're coasting along with a constant velocity of N for 22.5 s. The ejected gases have a mass that is small compared to the mass of the spacecraft. You then continue coasting with the rocket engines turned off. Where are you an hour later? (Think about what approximations or simplifying assumptions you made in your analysis. Also think about the choice of system: what are the surroundings that exert external forces on your system?) 7 (9796.8751 +504000j) = Additional Materials eBook m3q
- A dog and a sledge are on the frictionless ice of a frozen lake, 11.6 m apart but connected by a rope of negligible mass. The dog exerts a certain horizontal force (N) on the rope. If magnitudes of the sledge and the dog accelerations are o.8 m/s and o.2 m/s2, respectively. How far from the dog's initial position (m) do they meet?A 945-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 30.0 m/s. What is the average force exerted on the car during this time? ( in kN eastward)A car of mass 931 kg coasts on a level road, starting with an initial speed of 15.7 m/s and coming to rest 14.7 s later. Find the frictional force acting on the car.
- A mass of m = 0.500 kg slides across a horizontal frictionless counter with a speed vo= 0.300 m/s. It then runs into and compresses a spring of spring constant k-750 N/m. ୪୪୪୩ d O Weight, Normal, Spring Force, Friction O Weight, Spring Force, Friction O Weight, Normal, Spring Force O Weight, Normal, Friction Physics Principles (a) Pick all forces act on the spring-mass system as the mass compresses the spring. (b) Which of these forces do not do any work? C C -VO Weight, Normal Force, Spring Force Weight, Normal Force Normal, Spring Force Weight, Friction mSuppose you are navigating a spacecraft far from other objects. The mass of the spacecraft is 4.0 104 kg (about 40 tons). The rocket engines are shut off, and you're coasting along with a constant velocity of ‹ 0, 30, 0 › km/s. As you pass the location ‹ 6, 9, 0 › km you briefly fire side thruster rockets, so that your spacecraft experiences a net force of ‹ 5.0 105, 0, 0 › N for 20 s. The ejected gases have a mass that is small compared to the mass of the spacecraft. You then continue coasting with the rocket engines turned off. Where are you an hour later? (Think about what approximations or simplifying assumptions you made in your analysis. Also think about the choice of system: what are the surroundings that exert external forces on your system?)f = mAs a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air at a speed of 22.0 m/s. In the process, he moves his hand through a distance of 1.20 m. If the ball has a mass of 0.150 kg, find the force he exerts on the ball to give it this upward speed.
- Which of the following statements is incorrect? O Forces are vectors O An object in at rest will have no applied force at all on it. O An object accelerating in a certain direction will have a total force in the same direction. O An object at a constant velocity will have no net force on it. sA dog and a sledge are on the frictionless ice of a frozen lake, 12.6 m apart but connected by a rope of negligible mass. The dog exerts a certain horizontal force (N) on the rope. If magnitudes of the sledge and the dog accelerations are o.7 m/s² and o.1 m/s², respectively. How far from the dog's initial position (m) do they meet?Two forces É, = (81.24i – 26.83j) N and É, = (27.41i - 80.52j) N are exerted on a particle. The particle's mass is 23.21 kg. (a) Find the particle's acceleration in component form. (Express your answer in vector form.) a = m/s? (b) What are the magnitude and direction of the acceleration? magnitude |m/s2 direction counterclockwise from the +x axis